move <sigil> and <twigil>

... to HLL::Grammar since we are using it from NQP::Grammar
and Perl6::Grammar.

Author: FROGGS

src/HLL/Grammar.pm

@@ -49,6 +49,10 @@ grammar HLL::Grammar {
         ]
     }
 
+    token sigil { <[$@%&]> }
+
+    token twigil { <[*!?]> }
+
     token decint  { [\d+]+ % '_' }
     token decints { [<.ws><decint><.ws>]+ % ',' }